Posted by 4play on March 29, 2018 at 22:21:23 from (12.235.184.17):
In Reply to: Experts?????????? posted by Goose on March 29, 2018 at 07:35:31:
I question the ability of the shop you took it too, since he seems to be focused on the HVAC system. It's been mentioned but this sensor is wired to the engine computer (PCM) hence the "P0073" (P codes = powertrain faults). If you could monitor the sensor temp and voltage value from the PCM data it would help. This sensor works off of a 5 volt reference provided by the PCM. The sensor should have 5-volts on the violet/green wire with key on. Unplugged the PCM should also indicate 5 volts on the sensor voltage data value and temp reading of -40*. If you shorted the two wires together with a jumper the sensor data readings should be near 0 volts and read 130*
I doubt you have a problem on the sensor ground circuit to the PCM since it is shared with most of the other powertrain sensors. The sensor ground circuit splices to all the other engine sensors near the a/c compressor clutch take-out in the loom. My guess is a loose pin or possible broken 5V ref wire to the sensor. Monitor sensor data and wiggle/tug on wires/harness while watching for a change. Look for rub spots, pinch zones or areas where wiring looks like it might be moving around. Crash repair spots can be popular for wiring problems, rodent chew spots too.
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